Texas Instruments TPA6101A2 User manual

TPA6101A2
Audio Power Amplifier
Evaluation Module
2001 Mixed-Signal Products
User’s Guide
SLOU104A

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Copyright 2001, Texas Instruments Incorporated

Information About Cautions and Warnings
iii
Read This First
Preface
Read This First
How to Use This Manual
This document contains the following chapters:
- Chapter 1—Introduction
- Chapter 2—Quick Start
Information About Cautions and Warnings
This book may contain cautions and warnings.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.
This is an example of a warning statement.
A warning statement describes a situation that could potentially
cause harm to you.
The information in a caution or a warning is provided for your protection.
Please read each caution and warning carefully.

Running Title—Attribute Reference
iv
Related Documentation From Texas Instruments
J TI Plug-N-Play Audio Amplifier Evaluation Platform (literature
number SLOU011) provides detailed information on the evaluation
platform and its use with TI audio evaluation modules.
J TPA6101A2 50-mW Stereo Audio Power Amplifier (literature
number SLOS331) This is the data sheet for the TPA6101A2 audio
amplifier integrated circuit.
FCC Warning
This equipment is intended for use in a laboratory test environment only. It
generates, uses, and can radiate radio frequency energy and has not been
testedforcompliancewiththelimitsofcomputingdevices pursuant to subpart
Jofpart 15ofFCCrules,whicharedesignedtoprovidereasonableprotection
against radio frequency interference. Operation of this equipment in other
environments may cause interference with radio communications, in which
case the user at his own expense will be required to take whatever measures
may be required to correct this interference.

Running Title—Attribute Reference
v
Chapter Title—Attribute Reference
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Description 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 TPA6101A2 EVM Specifications 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Quick Start 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Precautions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Quick Start List for Platform 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Quick Start List for Stand-Alone 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Reference 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.1 TPA6101A2 Filterless Class-D EVM Schematic 2-5. . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.2 TPA6101A2 Audio Power Amplifier Evaluation Module Parts List 2-6. . . . . . . . . .
2.4.3 TPA6101A2 EVM PCB Layers 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running Title—Attribute Reference
vi
Figures
1–1 The TI TPA6101A2 Audio Amplifier Evaluation Module 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 Quick Start Platform Map 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Quick Start Module Map 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 TPA6101A2 Class-D EVM Schematic Diagram 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–4 TPA6101A2 EVM Top Layer 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–5 TPA6101A2 EVM Bottom Layer 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
2–1 Typical TI Plug-N-Play Platform Jumper and Switch Settings for the
TPA6101A2 EVM 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 TPA6101A2 EVM Parts List 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
Introduction
Introduction
This chapter provides an overview of the Texas Instruments (TI) TPA6101A2
audio amplifier evaluation module (SLOP336). It includes a list of EVM
features, a brief illustrated description of the module, and a list of EVM
specifications.
Topic Page
1.1 Features 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Description 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 TPA6101A2 EVM Specifications 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Features
1-2 Introduction
1.1 Features
The TI TPA6101A2 audio amplifier evaluation module and the TI plug-n-play
audio amplifier evaluation platform include the following features:
- TPA6101A2 Stereo Audio Power Amplifier Evaluation Module
J 1.6-V to 3.6-V operation
J Fixed-gain of 2 dB (inverting)
J Dual channel, single-ended operation
J 50-mW output power into 16 Ωat 3.3 V
J Verylowdistortion—THD+Nislessthan0.08%at1kHzandlessthan
0.2% from 20 Hz to 20 kHz into 16-Ωloads, and less than 0.06% at
1 kHz and less than 0.2% from 20 Hz to 20 kHz into 32-Ωloads
J Extremely low current consumption in shutdown mode
J Internal thermal and short-circuit protection
J Internal pop reduction circuitry
- Quick and Easy Configuration With the TI Plug-N-Play Audio Amplifier
Evaluation Platform
J Evaluation module is designed to simply plug into the platform,
automatically making all signal, control, and power connections
J Platform provides flexible power options
J Jumpers on the platform select power and module control options
J Switches on the platform route signals
J Platformprovides quick and easyaudio input and outputconnections
- Platform Power Options
J Onboard 9-V battery
J External 5-V –15-V (VCC) supply inputs
J External regulated VDD supply input
J Socket for onboard 5-V VDD voltage regulator EVM
J Onboard overvoltage and reverse polarity power protection
- Platform Audio Input and Output Connections
J Left and right RCA phono jack inputs
J Miniature stereo phone jack input
J Left and right RCA phono jack outputs
J Left and right compression speaker terminal outputs
J Miniature stereo headphone jack output

Description
1-3
Introduction
1.2 Description
The TPA6101A2 audio power amplifier evaluation module is a complete,
low-power stereo audio power amplifier for high-fidelity line-level output,
headphone, and small speaker applications. It consists of the TI TPA6101A2
50-mW stereo audio power amplifier IC in a very small MSOP package,along
with a small number of other parts mounted on a circuit board that is
approximately one and a quarter inches square (see Figure 1–1).
Figure 1–1.The TI TPA6101A2 Audio Amplifier Evaluation Module
†Due to the very small size of the MSOP IC package, the standard part number TPA6101A2 is
replaced with the code TIAJM.
Single in-line header pins are mounted to the underside of the module circuit
board to allow the EVM to be plugged into the TI plug-n-play audio amplifier
evaluationplatform,ortobewireddirectlyintoexistingcircuitsand equipment
when used stand-alone.
The platform has room for a single TPA6101A2 evaluation module and is a
convenient vehicle for demonstrating TI’s audio power amplifier and related
evaluation modules. The EVMs simply plug into the platform, which
automatically provides power to the modules, interconnects them correctly,
andconnectsthemtoaversatilearrayofstandardaudioinputandoutputjacks
and connectors. Easy-to-use configuration controls allow the platform and
EVMs to quickly model many possible end-equipment configurations.
There is nothing to build, nothing to solder, and nothing but the speakers
included with the platform to hook up.
1.3 TPA6101A2 EVM Specifications
Supply voltage range, VDD 1.6 V to 3.6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply current, IDD 160 mA, max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output power, PO: 16 Ω, VDD = 3.3 V 50 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio input voltage, VIVDD + 0.3 Vpp, max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum load impedance, RL16 Ω. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-4 Introduction

2-1
Quick Start
Quick Start
The steps in this chapter can be followed to prepare the TPA6101A2 audio
amplifier EVM for use. Using the TPA6101A2 EVM with the TI plug-n-play
audio amplifier evaluation platform is a quick and easy way to connect power,
signal and control inputs, and signal outputs to the EVM using standard
connectors. However, the audio amplifier evaluation module can be used
stand-alone by making connections directly to the module pins, and it can be
wired directly into existing circuits or equipment.
TheplatformswitchandjumpersettingsshowninTable2–1aretypicalforthe
TPA6101A2 EVM and will cause the TPA6101A2 IC to shutdown/mute when
a plug is removed from platform headphone jack J10.
Table 2–1. Typical TI Plug-N-Play Platform Jumper and Switch Settings for the
TPA6101A2 EVM
EVM JP6 JP7 JP8 S2 S3
TPA6101A2 X Lo X See Note 2 U5
Notes: 1) X = Don’t care
2) SetS2 to ONwhen signalconditioning boardis installedinU1; set S2
to OFF when no signal conditioning board is installed.
Topic Page
2.1 Precautions 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Quick Start List for Platform 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Quick Start List for Stand-Alone 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Reference 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

Precautions
2-2 Quick Start
2.1 Precautions
Power Supply Input Polarity and Maximum Voltage
Always ensure that the polarity and voltage of the external power
connected to VCC power input connector J1, J2, and/or VDD power
input connector J6 are correct. Overvoltage or reverse-polarity
power applied to these terminals can open onboard soldered-in
fuses and cause other damage to the platform, installed evaluation
modules, and/or the power source.
Inserting or Removing EVM Boards
Do not insert or remove EVM boards with power applied: Damage
to the EVM board, the platform, or both may result.
Figure 2–1.Quick Start Platform Map
Signal Conditioning
****CAUTION****
Do not insert or remove
EVM boards with power
applied
ICC
JP4
F1
VR1
R1
JP3
JP2 JP1 AC/DC
(J2)
VCC(J1)
D1 D2 D3
D4 J2
J3 J4 J5
AC/DC
In
VCC
In
+
J1
DC
SOURCE
LED1 VCC
LED2 VDD
R2
JP5 IDD
B1
U6
POWER
SUPPLY
U3 U4
U5
U1
U2
Audio
Power
Amps
OnOff ConditioningS2
J7 J8 Right
Out Left
Out
+–+–
JP6
Mode
Mute
Spk(U2-U4)
JP8
J9 Left
Out
JP7
S3 HP Source
U2-U4
U5
Polarity
Lo
Hi
HP(U5)
C3 C2
++
R3
R5
J10
Stereo
HP Out
TP1
GND
Plug-N-PlayAudio Amplifier
Evaluation Platform
SLOP097 Rev. C.1
Stereo
In
Right
In Left
In
J6 In/Out VDD
F2
VR2 +
DC
Power
In/Out
Speaker
Output
Headphone
Output
Audio
Input
Power
Input
Batt
C1+
Right
Out
On Off Pwr
S1
TEXAS INSTRUMENTS 1997
R4
6a
1
34
5
6b
6b
6b 7b
8
10
9
2

Quick Start List for Platform
2-3
Quick Start
2.2 Quick Start List for Platform
Follow these steps when using the TPA6101A2 EVM with the TI plug-n-play
audio amplifier evaluation platform (see the platform user’s guide, literature
number SLOU011, for additional details). Numbered callouts for selected
steps are shown in Figure 2–1.
- Platform preparations
1) EnsurethatallexternalpowersourcesaresettoOFFandthattheplatform
power switch S1 is set to OFF.
2) InstallaTPA6101A2moduleinplatformsocketU5,takingcaretoalignthe
module pins correctly.
3) Use switch S2 to select or bypass the signal conditioning EVM (U1).
4) Set control signal polarity jumper JP7 to Lo.
5) SetHpsourceswitchS3toU5toroutetheoutputsignal totheheadphone
Jack (J10).
- Power supply
6) Select and connect the power supply:
7) Connect an external regulated power supply set to a voltage between 1.6
V and 3.6 V to platform VDD power input connector J6, taking care to ob-
serve marked polarity,
or
8) Install a 3-V to 5-V voltage regulator EVM (SLVP097 or equiv.) in platform
socket U6. Install a 9-V battery in B1 or connect a 7-V to 12-V power
sourcetoaplatformVCC powerinputJ1orJ2 and jumper the appropriate
power input (see platform user’s guide). Set jumper JP1 on the SLVP097
to 3.3-V operation.
- Inputs and outputs
9) Ensurethat signal source level is set to minimum andthat potentiometers
R1 and R4 are set to the midpoint.
10) Connect the audio source to left and right RCA phono jacks J3 and J5 or
stereo miniature phone jack J4.
11) Connect 16-Ωto 32-Ωheadphones to headphone jack J10.
- Power-up
12) Verify correct voltage andinput polarity and setthe external power supply
toON.If VCC andanonboardregulatorEVMareusedtoprovide VDD,set
platform power switch S1 to ON.
PlatformLED2shouldlightindicatingthepresenceofVDD,andtheevaluation
modules installed on the platform should begin operation.

Quick Start List for Stand-Alone
2-4 Quick Start
2.3 Quick Start List for Stand-Alone
FollowthesestepstousetheTPA6101A2EVMstand-aloneor whenconnect-
ing it into existing circuits or equipment. Connections to the TPA6101A2 mod-
ule header pins can be made via individual sockets, wire-wrapping, or solder-
ing to the pins, either on the top or the bottom of the module circuit board.
Numbered callouts for selected steps are shown in Figure 2–2.
Figure 2–2.Quick Start Module Map
6
2
4
4
5
6
†Due to the very small size of the MSOP IC package, the standard part number TPA6101A2 is
replaced with the code TIAJM.
- Power supply
1) Ensure that all external power sources are set to OFF.
2) Connect an external regulated power supply set between 1.6 V and 3.3 V
to the module VDD and GND pins taking care to observe marked polarity.
- Inputs and outputs
3) Ensure that signal source level is set to minimum.
4) Connect the shutdown pin to VDD through a normally open switch.
5) Connect 32-Ωheadphones to the module VO1 and VO2 pins through
33-µFto1000-µFoutput-couplingcapacitors(seeFigure3–8)and return
to the GND pin, or
6) For line output, connections to the VO1 and VO2 pins must be made
through 33-µF to 1000-µF output-coupling capacitors and returned to
GND.
- Power-up
7) Verify correct voltage andinput polarity and setthe external power supply
to ON.
The EVM should begin operation.

TPA6101A2 EVM Schematic
2-5
Quick Start
2.4 Reference
2.4.1 TPA6101A2 EVM Schematic
The TPA6101A2 EVM schematic is shown in Figure 2–3.
Figure 2–3.TPA6101A2 EVM Schematic Diagram
IN1–
VO1
VDD
VO2
BYPASS
GND
SHUTDOWN
IN2–
C3
1 µF
C1
0.1 µF
8
7
6
5
1
2
3
4
ROUT
LOUT
RIN
TPA6101A2
C5
10 µF
+VDD
C4
0.1 µF
S1
SHUTDOWN
C2
0.1 µF
LIN
R1
100 kΩ

TPA6101A2 Audio Power Amplifier Evaluation Module Parts List
2-6 Quick Start
2.4.2 TPA6101A2 Audio Power Amplifier Evaluation Module Parts List
Table 2–2.TPA6101A2 EVM Parts List
Ref. Description Size Qty. Manufacturer/
Part Number Vendor/Number
C1, C2,
C4 Capacitor, 0.1 µF, ±10%,
Nonpolarized, SMD 0603 1 Murata GRM39X7R104K16 Arrow GRM39X7R104K16
C3 Capacitor, 1 µF, ±10%,
Nonpolarized, SMD 0603 1 Murata GRM39Y5V105Z010 Arrow GRM39Y5V105Z010
C5 Capacitor, 10 µF, 6.3 V,
SMD A 1 Panasonic ECS–TOJY106R Digi-Key PCS1106CT-ND
R1 Resistor, 100 kΩ, 1/16 W,
5%, SMD 0603 4 Panasonic ERJ-3GSYJ104 Digi-Key P100KGTR-ND
S1
(SHUT-
DOWN)
Switch, momentary, SMD 1 Panasonic
EVQ–PJS04K Digi-Key P8048SCT-ND
U1 IC, TPA6101A2DGK APA,
50 mW, 2 channel MSOP-8 1 TI TPA6101A2DGK
PnP Pins Terminal post headers 11 Sullins Digi-Key
S1022-36-ND
2.4.3 TPA6101A2 EVM PCB Layers
Thefollowingillustrations depicttheTPA6101A2PCBlayers.Thesedrawings
are not to scale. Gerber plots can be obtained from any TI sales office.
Figure 2–4.TPA6101A2 EVM Top Layer
Figure 2–5.TPA6101A2 EVM Bottom Layer